. A practical treatise on fractures and dislocations. re in place and the forearm fully extended theuppermost part of the olecranon, the point of the elbow, lies onor close below a transverse line drawn behind the limb from the epi-trochlea to the epicondyle; and when the elbow is flexed at a rightangle the same point lies a little more than an inch directly below andnearly midway between these two prominences in the prolongation ofthe long axis of the shaft of the humerus. Ordinarily the relationsof these three points to one another can be readily determined, evenwhen the region is swollen, a
. A practical treatise on fractures and dislocations. re in place and the forearm fully extended theuppermost part of the olecranon, the point of the elbow, lies onor close below a transverse line drawn behind the limb from the epi-trochlea to the epicondyle; and when the elbow is flexed at a rightangle the same point lies a little more than an inch directly below andnearly midway between these two prominences in the prolongation ofthe long axis of the shaft of the humerus. Ordinarily the relationsof these three points to one another can be readily determined, evenwhen the region is swollen, and they are the most convenient and trustworthy aid in the recognitionof the existence of a dislocation ofthe ulna. The outer border of the head ofthe radius can be felt about three-quarters of an inch below the epi-condyle in a line drawn from thelatter to the wrist, and it can befelt to move when the hand isgently rotated. This is the onlypoint where the interarticular lineis distinctly accessible to palpa-||f A tion; at all other points it is too. IIF- _B thickly covered by soft parts ormasked by the parallelism andclose contact of adjoining internal lateral ligamentarises above from the anterior,lower, and posterior portion of theepitrochlea and is broadly insertedbelow along the inner margin ofthe greater sigmoid cavity. The external lateral ligament,shorter and narrower than the in-The bones of the elbow: b, the axis of motion, ternal, arises above just below the epicondyle and becomes blendedbelow with the orbicular ligament that surrounds the head of theradius, some of its posterior fibres being continued to the ulna. The anterior and posterior ligaments are thin and loose, and close inthe joint between the lateral ligaments in front and behind, orbicular, or annular, ligament, placed like a ring about thehead of the radius and the adjoining portion of its neck, occupiesthree-fourths of a circle of which the remaining fourth is formed bythe
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